Engine-starter pinion



Juy 15 ,l 1924.

,501,53 H E vAN NEssA ENGINE STARTER PINION Filed Feb. 11. 1921 L lv///// Patented July l5, ld..

-Q MEW e.

Hmmr E. van or nmarna, new Yom, nssrenon 'ro ncnrrsn 'renr or mamma, New

A GDRPORATIGN 0F YORK."

ENGNE-STABTER PINION. l

Application 'led February it, 1921. Serial No. 444,103.

T o all wim/m t may concern.'

Be it known that I, Hanny E. VAN Nass, a citizen of the United States residing at Elmira, county of Chemung, tats of New York, have invented Improvements in Engine-Starter Pinions, of which the followinis a specication. y e

- y 'invention relates to a two part element of any kind and anew and useful method-of permanently connecting them together. ln practice my invention is used in connection with .the manufacture of the driving member such as a pinion of the drive or transmission of an engine starter inl which such inventlon finds useful appllcaf tion and for the sake of a clear and definite description. of my invention I will herein@ after describe it in connection with such particular use without intention vof limiting myself thereto. In the particular use shown the tworparts of the' element or pinion consist of the pinion proper and the weighted disk which is made separately therefrom and attached theretoaccording to the method hereinafter explained with the re- Sult that the two parts are mechanically permanently connected by machine operations which are comparatively simple and eco-v nomical.

In the drawin Fig. 1 is an elevation of the inner end org the pinion proper; Fig. 2 a side elevation thereof with a portion 'in section; Fig. 3 an end elevation of the disk; Fig. 4 an end elevation lo? the disk showing the same yapplied to the --pinion but not yet pressed to place; Fig. 5 a section on the hne 5 5 of Fig. 4; Fig. 6 a view similar to Fig. 5 but illustrating the element, or structure in completed form; Fig; 7 a section on the line 7-7 of Fig. 3 and i ig. 8 a cross section of an element or pinion which is modified 'to the extent of omission of the internal screw threads, and the provision cfa plain or unweighted disk.

Referring to the particular embodiment of my invention herein selected for a disclosure of my invention the element consists of two parts, to-wit, a pinion 1 and a weighted disk 2 which is in the form of -a rlng. This ring is to be permanently secured in mechanical manner to the pinion proper by the means and in the manner now to be ex-v plained. One form of the pinion structure and its use are exemplified by United States are here four in number.

VPatent No. 1,274,369 issued on August 6, 1918 to Vincent Bendix, for improvements in engine starters.

The pinion is transversely grooved by suitablemachine operations such as milling thereby forming a series orooves which Lach groove 3 has under-cut sides 4 and in addition acentral outwardly 'directed preferably sharpened wedge constituting a chisel in its action. By preferente, the bottoms of the grooves are inclined inwardly. from the lower ends of the wedge proper to the innen ends of said pndercuts. Alsm .the pinion teeth are cut back at one end as indicated at 6 to form a mounting for the disk 2.

The ring 2 which is provided with the over-balancing weight 7, integral therewith, is provided with a series of inwardly directed radial lugs 8 which correspond in number to the number of the grooves 3, so that inthe present instance there are tour of these lugs. These lugs are of a size to sub stantially fill the grooves 3 and the same are adapted to be .expended or spread laterally in said grooves and tightly against the sides of such grooves which by preference are under-cut as hereinbefore described in order will bite into these lugs, preferably, only partially thereinto, and will cause a distortion of the lugs and then a spreading of the inner portions -thereof laterally against the side walls of the grooves and into the undercuts@ by reason of the inclination of the bottoms of the'groove. The 'result of this method is the element or completed weighted pinion shown in Fig.` 6;

ln Fig. 8 l have shown a modified form of element which is the same as that above described with exception that the disk 9 is unweighted and pinion proper marked 10 is not Aprovided withl an internal screw threads such as the threa s 11 in Fig. 6 but provided with a smooth bone 12 for use on asomewhat different type of drive in which such pinion is not screw threaded upon a shaft. The pinion and its disk are thereby held securely together against displacementboth longitudinally and rotarily.

I claim: 1

1. An engine starter pinion comprising a bodynportion having a central bore andA provided on one end with transverse grooves having outwardly directed sharpened wedges in the middle portion of. the base of thel ooves', such grooves having straight but inclined sides to form underc-uts at the base thereof, and a disk portion having' inwardlyextending'radial lugs adapted to fit into the grooves and onto the wedges which split the lu and spread the mass thereof against the sides'of the grooves and into the under cuts, whereby the disk portion and body portion are held tightly together against ooves, such grooves having straight but v 1nclined sides to form undercuts at the base thereof, and the base of the grooves sloping outwardly'from the base of the wedges to the Yinner cornersvof' said undercut-s, and a disk portion having a series of inwardly extending radial lugs adapted to fit into the grooves and onto the wedges which split the l.

lugs and spread the mass thereof outwardly, the inner ends of the split lugs contacting the sloping bases of the grooves and beingv thereby directed into said undercuts.

HENRY E. VAN NESS. 

